/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.engine.load;

import org.apache.iotdb.common.rpc.thrift.TTimePartitionSlot;
import org.apache.iotdb.db.utils.TimePartitionUtils;
import org.apache.iotdb.tsfile.common.conf.TSFileConfig;
import org.apache.iotdb.tsfile.exception.write.PageException;
import org.apache.iotdb.tsfile.exception.write.UnSupportedDataTypeException;
import org.apache.iotdb.tsfile.file.header.ChunkHeader;
import org.apache.iotdb.tsfile.file.header.PageHeader;
import org.apache.iotdb.tsfile.file.metadata.IChunkMetadata;
import org.apache.iotdb.tsfile.file.metadata.statistics.Statistics;
import org.apache.iotdb.tsfile.read.common.Chunk;
import org.apache.iotdb.tsfile.utils.Binary;
import org.apache.iotdb.tsfile.utils.PublicBAOS;
import org.apache.iotdb.tsfile.utils.ReadWriteForEncodingUtils;
import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils;
import org.apache.iotdb.tsfile.write.chunk.ChunkWriterImpl;
import org.apache.iotdb.tsfile.write.schema.MeasurementSchema;
import org.apache.iotdb.tsfile.write.writer.TsFileIOWriter;

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Serializable;
import java.nio.ByteBuffer;

public class NonAlignedChunkData implements ChunkData {

    private final TTimePartitionSlot timePartitionSlot;
    private final String device;
    private final ChunkHeader chunkHeader;

    private final PublicBAOS byteStream;
    private final DataOutputStream stream;
    private long dataSize;
    private boolean needDecodeChunk;
    private int pageNumber;

    private ChunkWriterImpl chunkWriter;
    private Chunk chunk;

    public NonAlignedChunkData(
            String device, ChunkHeader chunkHeader, TTimePartitionSlot timePartitionSlot) {
        this.dataSize = 0;
        this.device = device;
        this.chunkHeader = chunkHeader;
        this.timePartitionSlot = timePartitionSlot;
        this.needDecodeChunk = true;
        this.pageNumber = 0;
        this.byteStream = new PublicBAOS();
        this.stream = new DataOutputStream(byteStream);

        addAttrDataSize();
    }

    private void addAttrDataSize() { // should be init before serialize, corresponding serializeAttr
        dataSize += 2 * Byte.BYTES; // isModification and isAligned
        dataSize += Long.BYTES; // timePartitionSlot
        int deviceLength = device.getBytes(TSFileConfig.STRING_CHARSET).length;
        dataSize += ReadWriteForEncodingUtils.varIntSize(deviceLength);
        dataSize += deviceLength; // device
        dataSize += chunkHeader.getSerializedSize(); // timeChunkHeader
    }

    @Override
    public String getDevice() {
        return device;
    }

    @Override
    public TTimePartitionSlot getTimePartitionSlot() {
        return timePartitionSlot;
    }

    @Override
    public long getDataSize() {
        return dataSize;
    }

    @Override
    public void setNotDecode() {
        needDecodeChunk = false;
    }

    @Override
    public boolean isAligned() {
        return false;
    }

    @Override
    public void writeToFileWriter(TsFileIOWriter writer) throws IOException {
        if (chunk != null) {
            writer.writeChunk(chunk);
        } else {
            chunkWriter.writeToFileWriter(writer);
        }
    }

    @Override
    public void serialize(DataOutputStream stream) throws IOException {
        ReadWriteIOUtils.write(isModification(), stream);
        ReadWriteIOUtils.write(isAligned(), stream);
        serializeAttr(stream);
        byteStream.writeTo(stream);
        close();
    }

    private void serializeAttr(DataOutputStream stream) throws IOException {
        ReadWriteIOUtils.write(timePartitionSlot.getStartTime(), stream);
        ReadWriteIOUtils.write(device, stream);
        ReadWriteIOUtils.write(needDecodeChunk, stream);
        chunkHeader.serializeTo(stream); // chunk header already serialize chunk type
        if (needDecodeChunk) {
            ReadWriteIOUtils.write(pageNumber, stream);
        }
    }

    @Override
    public void writeEntireChunk(ByteBuffer chunkData, IChunkMetadata chunkMetadata)
            throws IOException {
        dataSize += ReadWriteIOUtils.write(chunkData, stream);
        dataSize += chunkMetadata.getStatistics().serialize(stream);
    }

    @Override
    public void writeEntirePage(PageHeader pageHeader, ByteBuffer pageData) throws IOException {
        pageNumber += 1;
        dataSize += ReadWriteIOUtils.write(false, stream);
        dataSize += pageHeader.serializeTo(stream);
        dataSize += ReadWriteIOUtils.write(pageData, stream);
    }

    @Override
    public void writeDecodePage(long[] times, Object[] values, int satisfiedLength)
            throws IOException {
        pageNumber += 1;
        long startTime = timePartitionSlot.getStartTime();
        long endTime = startTime + TimePartitionUtils.getTimePartitionInterval();
        dataSize += ReadWriteIOUtils.write(true, stream);
        dataSize += ReadWriteIOUtils.write(satisfiedLength, stream);

        for (int i = 0; i < times.length; i++) {
            if (times[i] < startTime) {
                continue;
            } else if (times[i] >= endTime) {
                break;
            }

            dataSize += ReadWriteIOUtils.write(times[i], stream);
            switch (chunkHeader.getDataType()) {
                case INT32:
                    dataSize += ReadWriteIOUtils.write((int) values[i], stream);
                    break;
                case INT64:
                    dataSize += ReadWriteIOUtils.write((long) values[i], stream);
                    break;
                case FLOAT:
                    dataSize += ReadWriteIOUtils.write((float) values[i], stream);
                    break;
                case DOUBLE:
                    dataSize += ReadWriteIOUtils.write((double) values[i], stream);
                    break;
                case BOOLEAN:
                    dataSize += ReadWriteIOUtils.write((boolean) values[i], stream);
                    break;
                case TEXT:
                    dataSize += ReadWriteIOUtils.write((Binary) values[i], stream);
                    break;
                default:
                    throw new UnSupportedDataTypeException(
                            String.format("Data type %s is not supported.", chunkHeader.getDataType()));
            }
        }
    }

    private void deserializeTsFileData(InputStream stream) throws IOException, PageException {
        if (needDecodeChunk) {
            buildChunkWriter(stream);
        } else {
            deserializeEntireChunk(stream);
        }
    }

    private void deserializeEntireChunk(InputStream stream) throws IOException {
        ByteBuffer chunkData =
                ByteBuffer.wrap(ReadWriteIOUtils.readBytesWithSelfDescriptionLength(stream));
        Statistics<? extends Serializable> statistics =
                Statistics.deserialize(stream, chunkHeader.getDataType());
        chunk = new Chunk(chunkHeader, chunkData, null, statistics);
    }

    private void buildChunkWriter(InputStream stream) throws IOException, PageException {
        chunkWriter =
                new ChunkWriterImpl(
                        new MeasurementSchema(
                                chunkHeader.getMeasurementID(),
                                chunkHeader.getDataType(),
                                chunkHeader.getEncodingType(),
                                chunkHeader.getCompressionType()));
        boolean needDecode;
        for (int j = 0; j < pageNumber; j++) {
            needDecode = ReadWriteIOUtils.readBool(stream);
            if (needDecode) {
                int length = ReadWriteIOUtils.readInt(stream);
                for (int i = 0; i < length; i++) {
                    long time = ReadWriteIOUtils.readLong(stream);
                    switch (chunkHeader.getDataType()) {
                        case INT32:
                            chunkWriter.write(time, ReadWriteIOUtils.readInt(stream));
                            break;
                        case INT64:
                            chunkWriter.write(time, ReadWriteIOUtils.readLong(stream));
                            break;
                        case FLOAT:
                            chunkWriter.write(time, ReadWriteIOUtils.readFloat(stream));
                            break;
                        case DOUBLE:
                            chunkWriter.write(time, ReadWriteIOUtils.readDouble(stream));
                            break;
                        case BOOLEAN:
                            chunkWriter.write(time, ReadWriteIOUtils.readBool(stream));
                            break;
                        case TEXT:
                            chunkWriter.write(time, ReadWriteIOUtils.readBinary(stream));
                            break;
                        default:
                            throw new UnSupportedDataTypeException(
                                    String.format("Data type %s is not supported.", chunkHeader.getDataType()));
                    }
                }

                chunkWriter.sealCurrentPage();
            } else {
                PageHeader pageHeader = PageHeader.deserializeFrom(stream, chunkHeader.getDataType(), true);
                chunkWriter.writePageHeaderAndDataIntoBuff(
                        ByteBuffer.wrap(ReadWriteIOUtils.readBytesWithSelfDescriptionLength(stream)),
                        pageHeader);
            }
        }
    }

    public static NonAlignedChunkData deserialize(InputStream stream)
            throws IOException, PageException {
        TTimePartitionSlot timePartitionSlot =
                TimePartitionUtils.getTimePartition(ReadWriteIOUtils.readLong(stream));
        String device = ReadWriteIOUtils.readString(stream);
        boolean needDecodeChunk = ReadWriteIOUtils.readBool(stream);
        byte chunkType = ReadWriteIOUtils.readByte(stream);
        ChunkHeader chunkHeader = ChunkHeader.deserializeFrom(stream, chunkType);
        int pageNumber = 0;
        if (needDecodeChunk) {
            pageNumber = ReadWriteIOUtils.readInt(stream);
        }

        NonAlignedChunkData chunkData = new NonAlignedChunkData(device, chunkHeader, timePartitionSlot);
        chunkData.needDecodeChunk = needDecodeChunk;
        chunkData.pageNumber = pageNumber;
        chunkData.deserializeTsFileData(stream);
        chunkData.close();
        return chunkData;
    }

    private void close() throws IOException {
        byteStream.close();
        stream.close();
    }

    @Override
    public String toString() {
        return "NonAlignedChunkData{"
                + "dataSize="
                + dataSize
                + ", timePartitionSlot="
                + timePartitionSlot
                + ", device='"
                + device
                + '\''
                + ", chunkHeader="
                + chunkHeader
                + ", needDecodeChunk="
                + needDecodeChunk
                + '}';
    }
}
